What is the center of the circle that has a diameter whose endpoints are (2, 7) and (-6, -1)?

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Anyone know? will mark brainliest if you're correct!

Use the expression below.–4b + 8c + 12 – 8b – 2c + 6part asimplify the expression. enter your answers in the boxes. b + c + part bfactor the simplified expression using the gcf. a. 2(–2b + c + 3) b. 3(–2b + c + 3) c. 4(–2b + c + 3) d. 6(–2b + c + 3)part cwhat is the value of the expression when b = 2 and c = –3? enter your answer in the box.